Bcl-2 and IP3 compete for the ligand-binding domain of IP3Rs modulating Ca2+ signaling output

Hristina Ivanova, Larry E. Wagner, Akihiko Tanimura, Elien Vandermarliere, Tomas Luyten, Kirsten Welkenhuyzen, Kamil J. Alzayady, Liwei Wang, Kozo Hamada, Katsuhiko Mikoshiba, Humbert De Smedt, Lennart Martens, David I. Yule, Jan B. Parys, Geert Bultynck*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Bcl-2 proteins have emerged as critical regulators of intracellular Ca2+ dynamics by directly targeting and inhibiting the IP3 receptor (IP3R), a major intracellular Ca2+-release channel. Here, we demonstrate that such inhibition occurs under conditions of basal, but not high IP3R activity, since overexpressed and purified Bcl-2 (or its BH4 domain) can inhibit IP3R function provoked by low concentration of agonist or IP3, while fails to attenuate against high concentration of agonist or IP3. Surprisingly, Bcl-2 remained capable of inhibiting IP3R1 channels lacking the residues encompassing the previously identified Bcl-2-binding site (a.a. 1380–1408) located in the ARM2 domain, part of the modulatory region. Using a plethora of computational, biochemical and biophysical methods, we demonstrate that Bcl-2 and more particularly its BH4 domain bind to the ligand-binding domain (LBD) of IP3R1. In line with this finding, the interaction between the LBD and Bcl-2 (or its BH4 domain) was sensitive to IP3 and adenophostin A, ligands of the IP3R. Vice versa, the BH4 domain of Bcl-2 counteracted the binding of IP3 to the LBD. Collectively, our work reveals a novel mechanism by which Bcl-2 influences IP3R activity at the level of the LBD. This allows for exquisite modulation of Bcl-2’s inhibitory properties on IP3Rs that is tunable to the level of IP3 signaling in cells.

Original languageEnglish
Pages (from-to)3843-3859
Number of pages17
JournalCellular and Molecular Life Sciences
Volume76
Issue number19
DOIs
Publication statusPublished - 1 Oct 2019
Externally publishedYes

Keywords

  • Calcium channels
  • Inhibition
  • Inositol 1,4,5-trisphosphate receptor
  • Ligand-binding domain
  • Ligand–receptor interaction
  • Mechanism of interaction
  • Protein binding

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